cebcelitjs



v (No Model.)

L. J. CRECELIUS.

LIFTING JACK.

\\\' 'sented Oct. 28, 1888.

xls

LOUIS J. ORECELIUS, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO'ANDREW WARREN, OF SAME PLACE.

LIFTINGMJACK..

SPECIFICATION forming pari: of Letters Patent No. 391,692, dated October23, 1888.

Application filed April 10, 1888. Serial No. 270,219. (No model.)

To all whom it may concern:

Be it known that I, Louis J. ORnoELIUs, of St. Louis, in the State ofMissouri, have invented a new and useful Improvement in Lifting-Jacks;and I do hereby declare that the fol lowing is a full, clear, and exactdescription of the same.

My invention,hereinafter set forth,is animprovement in lifting-jacks ofthat class in which .ro a lifting-bar moving in a channeled standard israised and held by grips in the head and standard. It is designed moreparticularly for use in connection with the tapering liftingbar shown incertain applications filed by ine in the Patent Office of the UnitedStates, having, respectively', the Serial Nos. 256,133 and 256,134; butthe device is also applicable with good effect to other forms oflifting'bar.

The invention consists of an improved form 2o of gripping device forlifting the bar, or for holding it when lifted, and is applicable bothto the standard and head.

As the gripping device is applicable to the general form of jack shownin my said applications,or to the forms generally known, I do not deemit necessary to particularly describe the jack in all its parts, butonly those more immediately connected with lmy improve ments.

The accompanying drawings show, in Figure l, a central vertical sectionthrough the jack. Fig. 2 is a horizontal section on line :c x of Fig. l.Fig. 3 is a detail view of a modiV fication. Fig. 4 is a View of oneofthe gripping parts in section.

In the drawings, A represents the standard channeled to receive thelifting-bar B. The head C is raised by a lever pivoted on the standardand lifting the head in the ordinary 4o manner. The lifting-bar ispreferably tapered from the upper end downward and moves in a groove orchannel. The taper is shown on the lines a b,- but this groove orchannel or tapered face of the bar may be in any form of cross-section.In one side of the standard is a chamber or recess opening into thechannel, and in this chamber or recess is pivoted a wheel, D. The wheelis pivoted on a strong Steel pin, d,which has its bearings in the wallsofthe chamber. Between the face ofthe wheel 5o andthe face of the bar isa wedge-shaped block,

F, one face of which bears directly against the bar and the otheragainst the periphery of the wheel. Theamount oft-aper,both of the wedgeblock and of the bar, may be varied; but they must be proportioned toeach other so that the block shall bear with a gripping effect upon thebar in whatever vertical position the bar may be. The lower or thinnerpart of the block will be between the wheeland the thicker 6o part ofthe bar when said bar is lowered, and

as the bar rises the block will fall, always exercising its wedgingeffect upon the bar and gripping it, and thus holding it to the standardor to the head, as the case may be. The wheel turns with the rising orfalling of the block; but the face of the block bears upon the bar withfrictional contact, and slips thereon only when the bar is raised, whichloosens the block and allows it to drop by 7o gravity to fill the spacebetween the bar and wheel. The upper part of the block innst thereforebe between the bar and wheel when the bar is raised to bring itsthinnest end opposite the wheel, and the eXtreme upper end of the blockmust exceed in thickness the distance between the lower end of the barand the face of the wheel, to prevent the block dropping through and togive a certain grip under all circumstances. In other words, the Soamount of taper on the block exceeds that of the bar.

The faces of wheel and block which are in contact may be plain; but inorder to keep them in certain unison I prefer to forni them with teethwhich are constantly in mesh with each other. The special forms of thecogged faces are shown in Figs. l and 3. It is better that thebearing-faces which are under great pressure should be plain, and forthis purpose 9o I make the teeth upon one-the wheel, for eX- ainple-inthe form of a sunken peripheral rack, f, in the center of the face ofthe wheel, and a rack, g, with raised teeth, fitted to that on the wheelon the central longitudinal line of the block. On either side of theseracks is a plain surface, and the teeth are so fitted to each other thatthe plain surfaces will bear upon each other when the racks are inengagenient, the teeth serving only to hold the parts in unison. Thesunken teeth may, so far as the operation is concerned, be on eitherblock or Wheel.

A lifting-lever, f2, carrying a pin, g', is provided on the standard,the pin entering a hole in the bottom of the chamber, so as to lift theblock when the lever is depressed. rIhis lever may be operated by thefoot or hand Whenever it is desired to raise the block to release thebar, as in lowering.

The head is provided With4 the Wedgingblock F and Wheel D, and aspring-pin, 2, above the block, of the same construction as describedfor the standard; but the lifting-lever and pin are not required for thehead, but only a pin, g, set in the standard and projecting into thechamber in the head when the head is down on the standard to lift theunder block out of engagement. As the head is lifted, or as the bar isdrawn down by the load, the block Wedges between the bar and the Wheeland forms a secure grip. The teeth or frictional contact hold the blockin proper relation to the Wheel, and as the bar rises the block andwheel, acting in unison, occupy the increased space caused by the taperon the bar and compensate for the taper. The 10W- ering is performed inthe manner above indicated by releasing the lower grip and Working thelever to release the upper grip in the head.

The Wedge may be formed upon the Wheel instead of the block, as is shownin Fig. 3, and with the same effect. In this form the block F may be ofuniform thickness. It has a plain face bearing upon the tapered bar andthe same kind of a plain or toothed face as the block F. The Wheel D isvin this case eccentric on its pivoting-bolt, and the Wedging ac tion isgiven by the eccentric or curved Wedge on the Wheel. In both forms thereis a wheel and block with a Wedging-face, and there is a combinedgripping action arising from the Wedging of the block and Wheels and thetaper of the bar.

The Working parts may be made of hardened cast-steel and are allremovable, so that they may be replaced when Worn; but the Wear isdistributed over the Workingsurfaces and is slight.

In connection with the tapering bar this form of grip gives a Wedgingaction on both sides of the block-that is to say, on the plain side ofthe block in the wedging action of the bar, the inclined face of whichbears on the block, and as the other sideof the block is its own taperor that of the Wheel, so that neither can slip.

The operating-lever A' is shown in dotted lines in Fig. l, and consistsof a socket pivoted to the upper end of the standard With links, as ata', connecting short arms a2 of the lever, which pass to either side ofthe standard, With the lifting-head C, so that the lifting movement isobtained by the depression of the lever. Only one link and one arm,a",isshown in the drawings, being represented in dotted lines.

I claim as my inventionl. In combination with the lifting-bar B of ajack and a lifting head,O, and lever, awedging-Wheel and block, saidWheel being journaled in bearings to have rotary movement, and the blockbeing arranged between said journaled Wheel and the face of thelifting-bar, substantially as described.

2. In combination With the lifting-har of a jack anda suitable head andliftinglevcr, a Wedging gear-Wheel and block having plain and toothedsurfaces in contact, said block heing arranged to bear on the face ofthe bar, all substantially as described.

3. In combination with the lifting-bar of a jack, a suitablelifting-head and lever therefor, a wedging-Wheel journaled in fixedbearings to have rotary, movement, and a block arranged in the chamberof thestandard, said block having a smooth bearing-face in contact Withthe face ofthe lifting-bar and a rear face in positive connection withthe wedging- Wheel. substantially as described.

4. In combination with a tapering liftingbar ofajack, a lifting-head andlever there` for, and a wedging gear-wheel and block arranged in thechamber of the standard, the block bearing upon the face of the bar,allsubstantially as described.

In testimony whereof I have signed my naine to this specification in thepresence of two subscribing Witnesses.

LOUIS J. OREGELIUS.

Witnesses:

C. D. GREENE, Jr., GHAs. A. THoMPsoN.

IOO

